gnu/usr.bin/gdb/kgdb/trgt.c

   1 /*
   2  * Copyright (c) 2004 Marcel Moolenaar
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  *
  26  * $FreeBSD: src/gnu/usr.bin/gdb/kgdb/trgt.c,v 1.12 2008/05/01 20:36:48 jhb Exp $
  27  */
  28
  29 #include <sys/cdefs.h>
  30
  31 #include <sys/param.h>
  32 #include <sys/sysctl.h>
  33 #include <sys/user.h>
  34 #include <err.h>
  35 #include <fcntl.h>
  36 #include <kvm.h>
  37
  38 #include <defs.h>
  39 #include <readline/readline.h>
  40 #include <readline/tilde.h>
  41 #include <command.h>
  42 #include <exec.h>
  43 #include <frame-unwind.h>
  44 #include <gdb.h>
  45 #include <gdbcore.h>
  46 #include <gdbthread.h>
  47 #include <inferior.h>
  48 #include <language.h>
  49 #include <regcache.h>
  50 #include <solib.h>
  51 #include <target.h>
  52 #include <ui-out.h>
  53 #include <observer.h>
  54
  55 #include "kgdb.h"
  56
  57 static void     kgdb_core_cleanup(void *);
  58
  59 static char *vmcore;
  60 static struct target_ops kgdb_trgt_ops;
  61
  62 kvm_t *kvm;
  63 static char kvm_err[_POSIX2_LINE_MAX];
  64
  65 #define KERNOFF         (kgdb_kernbase ())
  66 #define INKERNEL(x)     ((x) >= KERNOFF)
  67
  68 static CORE_ADDR
  69 kgdb_kernbase (void)
  70 {
  71         static CORE_ADDR kernbase;
  72         struct minimal_symbol *sym;
  73
  74         if (kernbase == 0) {
  75                 sym = lookup_minimal_symbol ("kernbase", NULL, NULL);
  76                 if (sym == NULL) {
  77                         kernbase = KERNBASE;
  78                 } else {
  79                         kernbase = SYMBOL_VALUE_ADDRESS (sym);
  80                 }
  81         }
  82         return kernbase;
  83 }
  84
  85 static void
  86 kgdb_trgt_open(char *filename, int from_tty)
  87 {
  88         struct cleanup *old_chain;
  89         struct kthr *kt;
  90         struct inferior *inf8;
  91         struct program_space *pspace;
  92         kvm_t *nkvm;
  93         char *temp;
  94         int first_inferior = 1;
  95
  96         target_preopen (from_tty);
  97         if (!filename)
  98                 error ("No vmcore file specified.");
  99         if (!exec_bfd)
 100                 error ("Can't open a vmcore without a kernel");
 101
 102         filename = tilde_expand (filename);
 103         if (filename[0] != '/') {
 104                 temp = concat (current_directory, "/", filename, NULL);
 105                 xfree(filename);
 106                 filename = temp;
 107         }
 108
 109         old_chain = make_cleanup (xfree, filename);
 110
 111         nkvm = kvm_openfiles(bfd_get_filename(exec_bfd), filename, NULL,
 112             write_files ? O_RDWR : O_RDONLY, kvm_err);
 113         if (nkvm == NULL)
 114                 error ("Failed to open vmcore: %s", kvm_err);
 115
 116         /* Don't free the filename now and close any previous vmcore. */
 117         discard_cleanups(old_chain);
 118         unpush_target(&kgdb_trgt_ops);
 119
 120         kvm = nkvm;
 121         vmcore = filename;
 122         old_chain = make_cleanup(kgdb_core_cleanup, NULL);
 123
 124         push_target (&kgdb_trgt_ops);
 125         discard_cleanups (old_chain);
 126
 127         kgdb_dmesg();
 128
 129         init_thread_list();
 130         kt = kgdb_thr_init();
 131         while (kt != NULL) {
 132                 if (!in_inferior_list(kt->pid)) {
 133                      if (first_inferior) {
 134                        first_inferior = 0;
 135                        inf8 = current_inferior();
 136                        inf8->pid = kt->pid;
 137                        inferior_appeared (inf8, kt->pid);
 138                        pspace = current_program_space;
 139                        pspace->ebfd = 0;
 140                        pspace->ebfd_mtime = 0;
 141                      } else {
 142                        inf8 = add_inferior(kt->pid);
 143                        pspace = add_program_space(new_address_space());
 144                        pspace->symfile_object_file = symfile_objfile;
 145                        pspace->objfiles = object_files;
 146                        pspace->target_sections =
 147                                current_program_space->target_sections;
 148                      }
 149                      inf8->pspace = pspace;
 150                      inf8->aspace = pspace->aspace;
 151                 }
 152                 add_thread(ptid_build(kt->pid, 0, kt->tid));
 153                 kt = kgdb_thr_next(kt);
 154         }
 155         if (curkthr != 0)
 156                 inferior_ptid = ptid_build(curkthr->pid, 0, curkthr->tid);
 157
 158         frame_unwind_prepend_unwinder(get_frame_arch(get_current_frame()), &kgdb_trgt_trapframe_unwind);
 159
 160         /* XXX: fetch registers? */
 161         kld_init();
 162         reinit_frame_cache();
 163         select_frame (get_current_frame());
 164         print_stack_frame(get_selected_frame(NULL),
 165           frame_relative_level(get_selected_frame(NULL)), 1);
 166 }
 167
 168 static void
 169 kgdb_trgt_close(int quitting)
 170 {
 171
 172         if (kvm != NULL) {
 173                 inferior_ptid = null_ptid;
 174                 clear_solib();
 175                 if (kvm_close(kvm) != 0)
 176                         warning("cannot close \"%s\": %s", vmcore,
 177                             kvm_geterr(kvm));
 178                 kvm = NULL;
 179                 xfree(vmcore);
 180                 vmcore = NULL;
 181         }
 182 }
 183
 184 static void
 185 kgdb_core_cleanup(void *arg)
 186 {
 187
 188         kgdb_trgt_close(0);
 189 }
 190
 191 static void
 192 kgdb_trgt_detach(struct target_ops *target, char *args, int from_tty)
 193 {
 194
 195         if (args)
 196                 error ("Too many arguments");
 197         unpush_target(target);
 198         reinit_frame_cache();
 199         if (from_tty)
 200                 printf_filtered("No vmcore file now.\n");
 201 }
 202
 203 static char *
 204 kgdb_trgt_extra_thread_info(struct thread_info *ti)
 205 {
 206
 207         return (kgdb_thr_extra_thread_info(ptid_get_tid(ti->ptid)));
 208 }
 209
 210 static void
 211 kgdb_trgt_files_info(struct target_ops *target)
 212 {
 213
 214         printf_filtered ("\t`%s', ", vmcore);
 215         wrap_here ("        ");
 216         printf_filtered ("file type %s.\n", "DragonFly kernel vmcore");
 217 }
 218
 219 static void
 220 kgdb_trgt_find_new_threads(struct target_ops *target_ops)
 221 {
 222         struct target_ops *tb;
 223
 224         if (kvm != NULL)
 225                 return;
 226
 227         tb = find_target_beneath(target_ops);
 228         if (tb->to_find_new_threads != NULL)
 229                 tb->to_find_new_threads(target_ops);
 230 }
 231
 232 static char *
 233 kgdb_trgt_pid_to_str(struct target_ops *target_ops __unused, ptid_t ptid)
 234 {
 235         return (kgdb_thr_pid_to_str(ptid));
 236 }
 237
 238 static int
 239 kgdb_trgt_thread_alive(struct target_ops *target_ops __unused, ptid_t ptid)
 240 {
 241         return (kgdb_thr_lookup_tid(ptid_get_tid(ptid)) != NULL);
 242 }
 243
 244 static LONGEST
 245 kgdb_trgt_xfer_partial(struct target_ops *ops, enum target_object object,
 246                        const char *annex, gdb_byte *readbuf,
 247                        const gdb_byte *writebuf,
 248                        ULONGEST offset, LONGEST len)
 249 {
 250         if (kvm != NULL) {
 251                 if (len == 0)
 252                         return (0);
 253                 if (writebuf != NULL)
 254                         return (kvm_write(kvm, offset, writebuf, len));
 255                 if (readbuf != NULL)
 256                         return (kvm_read(kvm, offset, readbuf, len));
 257         }
 258         return (ops->beneath->to_xfer_partial(ops->beneath, object, annex,
 259                                               readbuf, writebuf, offset, len));
 260 }
 261
 262 static void
 263 kgdb_switch_to_thread(struct kthr *thr)
 264 {
 265         char buf[16];
 266         int thread_id;
 267         char *err;
 268
 269         thread_id = pid_to_thread_id(ptid_build(thr->pid, 0, thr->tid));
 270         if (thread_id == 0)
 271                 error ("invalid tid");
 272         snprintf(buf, sizeof(buf), "%d", thread_id);
 273         if (!gdb_thread_select(uiout, buf, &err))
 274                 error ("%s", err);
 275 }
 276
 277 static void
 278 kgdb_set_proc_cmd (char *arg, int from_tty)
 279 {
 280         CORE_ADDR addr;
 281         struct kthr *thr;
 282
 283         if (!arg)
 284                 error_no_arg ("proc address for the new context");
 285
 286         if (kvm == NULL)
 287                 error ("only supported for core file target");
 288
 289         addr = (CORE_ADDR) parse_and_eval_address (arg);
 290
 291         if (!INKERNEL (addr)) {
 292                 thr = kgdb_thr_lookup_pid((int)addr);
 293                 if (thr == NULL)
 294                         error ("invalid pid");
 295         } else {
 296                 thr = kgdb_thr_lookup_paddr(addr);
 297                 if (thr == NULL)
 298                         error("invalid proc address");
 299         }
 300         kgdb_switch_to_thread(thr);
 301 }
 302
 303 static void
 304 kgdb_set_tid_cmd (char *arg, int from_tty)
 305 {
 306         CORE_ADDR addr;
 307         struct kthr *thr;
 308
 309         if (!arg)
 310                 error_no_arg ("Thread address for the new context");
 311
 312         addr = (CORE_ADDR) parse_and_eval_address (arg);
 313         thr = kgdb_thr_lookup_taddr(addr);
 314
 315         if (thr == NULL)
 316                 error("invalid thread address");
 317
 318         kgdb_switch_to_thread(thr);
 319 }
 320
 321 int fbsdcoreops_suppress_target = 1;
 322
 323 void
 324 initialize_kgdb_target(void)
 325 {
 326         kgdb_trgt_ops.to_magic = OPS_MAGIC;
 327         kgdb_trgt_ops.to_shortname = "kernel";
 328         kgdb_trgt_ops.to_longname = "kernel core dump file";
 329         kgdb_trgt_ops.to_doc =
 330     "Use a vmcore file as a target.  Specify the filename of the vmcore file.";
 331         kgdb_trgt_ops.to_stratum = process_stratum;
 332         kgdb_trgt_ops.to_has_registers = default_child_has_registers;
 333         kgdb_trgt_ops.to_has_memory = default_child_has_memory;
 334         kgdb_trgt_ops.to_has_stack = default_child_has_stack;
 335
 336         kgdb_trgt_ops.to_open = kgdb_trgt_open;
 337         kgdb_trgt_ops.to_close = kgdb_trgt_close;
 338         kgdb_trgt_ops.to_attach = find_default_attach;
 339         kgdb_trgt_ops.to_detach = kgdb_trgt_detach;
 340         kgdb_trgt_ops.to_extra_thread_info = kgdb_trgt_extra_thread_info;
 341         kgdb_trgt_ops.to_fetch_registers = kgdb_trgt_fetch_registers;
 342         kgdb_trgt_ops.to_files_info = kgdb_trgt_files_info;
 343         kgdb_trgt_ops.to_find_new_threads = kgdb_trgt_find_new_threads;
 344         kgdb_trgt_ops.to_pid_to_str = kgdb_trgt_pid_to_str;
 345         /*
 346         kgdb_trgt_ops.to_store_registers = NULL;
 347         */
 348         kgdb_trgt_ops.to_thread_alive = kgdb_trgt_thread_alive;
 349         kgdb_trgt_ops.to_xfer_partial = kgdb_trgt_xfer_partial;
 350         add_target(&kgdb_trgt_ops);
 351
 352         add_com ("proc", class_obscure, kgdb_set_proc_cmd,
 353            "Set current process context");
 354         add_com ("tid", class_obscure, kgdb_set_tid_cmd,
 355            "Set current thread context");
 356 }